13) Astronauts returning to Earth from an extended stay in space have to be extremely careful not to break a bone. It takes several weeks to restore normal bone strength. Which would be the best regimen to rebuild the lost bone tissue?A) Stay inactive, avoiding exercise until the lost bone tissue is rebuilt.B) Hit the gym and get going with a few weeks of heavy weight lifting.C) Several weeks of swimming will rebuild all lost bone mass.D) Start with walking and build up to jogging, with an extra regimen of light weight lifting in the gym.

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